u.s. school would help prevent similar tragedies in the future. the bbc's north america editor reports. >> the church bells tolled out the exact time when a week ago a young man with an assault rifle began his massacre of children. they stood in prayer and in silence in the rain. in a town still numb, the bells tolled 26 times, one for each of the victims of the school. inside the white house, president obama and his staff since silent for a minute. beyond the grave, resolution. in a new video, he has promised he will push for a ban on assault rifles. >> i will do everything in my power as president to advance these efforts. if there's even one thing we can do as a country to protect our children, we have a responsibility to try. >> shame on the nra. >> there are those who blame the national rifle association for consistently, powerful lobbying against gun control. they have been consistently silent until now, and some expected they would seek compromise. none of it. instead, raw fury, blaming video games, the culture. >> we have blood-of films out there like "american psycho,"